Ventilator of the ejector type



Jui. 5 ,1925. 1,568,373

E. FORD VENTILATOR OF- THE EJECTOR TYPE Filed Oct. 25, 1924 Patented Jan. 5, 1926.

UNITED STATES ERNEST LEONARD FORD, OF DABLINGTON, ENGLAND.

:V'ENTILATOR OF THE EJ'ECTOR TYPE.

7 Application filed October 25, 1924. Serial No. 745,915.

To all 7.07! am it may concern Be it known that I, ERNEST LEONARD Form, a subject of the King of Great Britain and Ireland, residing at Honeypot Works, Honeypot Lane, Darlington, in the county of Durham, England, have invented certain new and useful Improvements in Ventilators of the Ejector Type, of which the following is a specification.

This invention relates to ventilators of vation, end elevation and plan respectively,

and

Figure 4 is a view in on line 0 c Figure 3.

Throughout the views similar parts are marked with like numerals. of reference.

The hollow chamber 1 is of lozenge or rhomb shape and has both its sides 2 and its to 3 of convex form and in each of the si es 2 are two apertures 4 and 5 the apertures 4 being approximately to one end of the chamber and those 5 being approximate to the other end thereof. These apertures are of approximately V-shape with their apices towards the ends of the chamber. On each side of the chamber are two exterior plates forming deflectors 6 and 7 which are preferably inclined or curved so as to coincide or register with the edges of the apertures nearest to the ends of thelongitudinal section body. The deflectors of each pair of apertures 4, 4 and 5, 5 are extended across the interior of the body 1 to form interior deflectors 8 and 9 and at the bottom of'each of said interior deflectors at its centre is formed a V-shaped projection '10 the apex of which points towards the centre of the chamber." In the platewhich forms the base 11: of the interior of the chamber is a narrow centrally arranged transverse aperture 12 andsaid base slopes upwards from each end of the chamber towards said aperture and terminates at said aperture in upwardly curved lips 13, On the interior walls of the sides 2 of the chamber 1 at the centre thereof are projections 14 which operate to restrict the width of the interior of the chamber at the aperture 12. At the tops of the deflectors or vanes 6 and 7 are horizontally or approximately horizontally disposed plates 15 which extend towards the centre of the chamber and preferably taper towards said point and which may be provided with openings 16 which intensify the negative pressure at the apertures 4 or 5 by reason of the flow of air over said openings.

The action of the ventilator is as follows Directly the vehicle is in motion and so long as it continues to move at a slow speed a current of air strikes the front pair of deflectors-say 6 and 6and is deflected by them over the front pair of apertures 4 and 4 thus setting up a negative pressure or partial vacuum at said apertures. This negative pressure creates a similar negative pressurein the interior of the chamber 1 which causes a suction action at the central aperture 12 in its base thereby extracting the air out of the body of the vehicle through the hole in the roof with which said aperture registers. The current of air after passing the front pair of deflectors 6 and 6 flows inwardly towards the sides 2 and is caught by the rear pair of deflectors 7 and 7 and is deflected into the interior of the chamber through the rear apertures 5 and 5 at an increased positive pressure which flowing forward over the aperture 12 augments the negative pressure-in the front part of the. chamber and so assists to increase the suction effect at the central aperture 12. This suction effect is maintained even at extremely low speeds by reason of the restriction of the width of the chamber at its central part by the projections 14 and 14,.the upward slope of the base 11 of the chamber, the upturned lips 13 of said base at the edges of the central aperture and the curvature of the top 3 of the chamber 1. When higher speeds are attained the area of negative pressure set up by the front pair of deflectors is considerably increased and extends completely around the outside of the chamber so that a negative pressure is set up at the rear apertures as well as at the front ones whereby a negative pressure or partial vacuum is produced at alt) both ends of the chamber. When a side or three-quarter wind-is blowing, the deflectors opposite to those facing the wind set up the necessary suction effect and in the case of a following wind which is "blowing at a greater speed than the vehicle is travelling the action is exactly the same only reversed.

I wish it to be clearly understood that I may use any number of apertures 4: and 5 on each side of the chamber 1 and at each end thereof and that the deflectors coacting witlrsaid apertures'may beset at any suitable angle both with the "base and side walls of said chamber. 'Further I do not limit myself to the useofa'single suction aperture in the interior of the chamber.

hat I claim is 1. A ventilator of the ejector type comprising achamber which consists of a base having atransverselyarranged opening at the centre ofits length,-a top, and a pair ot-forward and rearward converging side walls having openings located in opposed pairsnearthe ends of the chamber, and plates forming xterior deflectors on the side walls of said chamber adjacent to said side openings.

'2. A ventilator ot the ejector type comprising a chamber which consists of a base having a centrally arranged transverse opening, a top, and side walls which converge towards the ends of the chamber and have openings located in opposed pairs near the ends of the chamber, and incline'dplates forming exterior deflectors on the side walls of the chamber which register with the forward edges of the side openings therein.

3. A ventilator'of the ejector type comprising achamber consisting of a base having a centrally arranged transverseopening, a top, side walls connecting said base ands-aid top and which converge towards each end of the chamber and in which are pairs of angularly' shaped openings which are located in opposed pairs near the ends ofthechamber; inclined plates onthe side walls of saidcha'mber adjacent to said side openings which form exterior deflectors, and interior deflectors at each end of the chamber.

i. A ventilator ot the ejector type comprising achzunber'which consists of a' base havingaftrjansve'rse and centrally arranged opening and which slopes upwardly towards the centre at its length, a top, and 'side walls' between said base and said top each having a pair of V-shaped openings located near the'ends' of said chamber the apex of each opening-being towards one end of the chamber, 'inclinechplates' forming ex- "terior- 'deflectors on the sidewalls of said chamber -which --register with the upper edges of SZIJCl V-shaped openings, interior L deflectors at each-"end of. the chamber which "coact-with the exter-ioradeflectors, and prow jections on the interior side walls of the chamber which operate to restrict its width at the opening in its base.

An exhaust ventilator the width of:

which tapers from its centre to each end comprising a base which slopes upwardly towards thepentre of its length and has a transverse centrally arranged opening, a top, and side walls between said base and said top, said side walls having Vshaped openings located in opposed pairs near the cnds'of the apparatus each with its apex to wards the adjacent end of the apparatus, inclined plates'forniing exterior deflectors on the side walls of said apparatus which register with the upper edges of said side openings. interior deflectors which extend across the interior of the apparatus at each end thereot and coact with the exterior deflectors, .V-shaped projections at the center of each interior deflectorthe apex of each of which points towards the centre of the apparatus. and projections on the interior side walls of the apparatus which operate to restrict its' width at the central opening in its base.

6. An exhaust ventilator the width of which-tapers from the centre towards each end comprising a top which is of convex form, a base which slopes upwardly to wards the centre of itslength, and hasa transverse centrally arranged opening, and two side walls which converge towardst-he ends of the apparatusrand have V-shaped openings located in opposed pairs near the ends of the apparatus eachwith its apex towards the adjacent end of the apparatus, inclined plates formingexterior deflectors on the side walls of said apparatus which register with. the upper edges of said side openings, interior deflectors lying within and across each end of the apparatus which coa'ct' withthe exterior deflectors, 'V-shaped projections at the centre of each interior de- "'flector the apex of each of which points towards'the centreot the apparatus and projections'on the interior side walls of the apparatus which operate to restrict its width at the opening in its base.

7.-An' exhaust ventilator the width of which tapers from its centre towards each end comprising a base which slopes upwardly towards the centre of its length, and

has an opening at'said centre, a top located above said base'and two side walls which converge towards the ends of the apparatus and have V-shaped openings located in 0pposed pairs near the ends 0% the apparatus each with its apex towards the adjacent end of the-apparatus, inclined plates forming exterior deflectors on the side walls of said flectors Whichlie within andacross each end ofthe apparatus and coact with the exterior deflectors, V-shaped projections at the centre of each interior deflector the apex of each of which points towards the centre of the apparatus, horizontally disposed apertured extensions of the exterior deflectors, and projections on the interior side walls of the ap paratus which operate to restrict its width at the opening in its base.

8. A donble-ended symmetrical exhaust ventilator comprising a base having a narrow centrally located opening, a roof above said base, a pair of forward and a pair of rearward converging side walls between said base and said roof having openings commnnicating with the interior of the vent-i1 lator, a pair of forwardly and a pair of rearwardly inclined plates on the exterior of the side walls fore and aft respectively of the openings in said side walls, and an interior wall at each end of the ventilator lying between the forward edges of each pair of openings in the side walls and extending from the base to the roof.

' 9. A double-ended symmetrical exhaustventilator comprising a base having a narrow centrally located opening, a roof above said base, a pair of forward and a pair of rearward converging side walls between said base and said roof having openings communicatin with the interior of the ventilator, a pair of forwardly and a pair of rear: wardly inclined plates on the exterior of the side walls fore and aft respectively of the openings in said side walls, an interior wall at each end of the ventilator lying between the forward ed es of each pair of openings in the side wa ls and extending from the base to the roof, and interior transverse projections on the side walls restricting the centrally arranged opening in the base.

10. A double-ended symmetrical exhaust ventilator comprising a base sloping upwardly towards the centre of its length and having a narrow transversely arranged opening at said centre, a top above said base, a pair of forwardly and a pair of rearward converging side walls between said base and said top, having openings communicating with the interior of the ventilator, a pair of forwardly and a pair of rearwardly inclined plates located on the exterior of the side walls in alignment with the forward edges of the openings in said side walls, horizontally disposed extensions of said inclined plates at the upper edges of same, an interior wall at each end of the ventilator lying between the forward edges of each pair of openings in the side walls and extending from the base to the top, and interior transverse projections on the side walls restricting the centrally arranged opening in the base.

ERNEST LEONARD FORD. 

